Chromium plating by electrolytic deposition



Patented 7, 193 1 g i UNITED STATES PATENT OFFICE aueus'm 30mm, or rams,armors, assmuon 'ro socm'rit NOUVELLE DE LORFEVREBIE DEBC'UIB, OF PARIS,FRANCE, A CORPORATION OF IBANQE CHBOHIUH PLATIN G BY ELECTROLYTICDEPOSITION No Drawing. Application ma December 21, 1928,8er1a1 No.387,749, and in Iranee January 12, 1088.

The present invention relates to chromating by electrolyticdepositionyand it consists in arranging the body tobe coated at thecathode of an electrolytic bath composed of 5 an aqueous solution ofsodium bichromate,

chromic acid and chromium fiuoborate.

The'proportions of the substances which enter into the composition ofthe bath should not difier substantially from the following, 1 whicharegiven, by way of example, for a 100-liter bath:

Sodium bichromate r 25 kgs Ghromic acid kgs. Chromium fiuoborate 900grs.

A bath for chromium plating conductive bodies by electrolytic degpsitioncomprising sodium ichromate, 25 'lograms' chromic acid, 15 kilograms;and chromium iiuoborate, 900 grams. go. 3 AUGUSTE HOLLARD.

